Why do women NEED to be sweet and kind in order to get assistance in life but men can act bold and aggressive?

I am having issues with my new car. I have brought it back to the dealership three times (which is inconvenient when you have to work) and the issue remains. Feeling a bit frustrated I asked the "manager" in the service dept. if I could speak with the general manager - service dept. and dealership are attached. I waited 20 minutes before both men arrived looking very stern and said "What exactly is YOUR problem?" I explained the issue (even though they KNEW what the issue was). They looked at each other and jointly agreed (w/o the conversation being directed my way) that the manufacturer should be notified. Meanwhile a gentleman next to me (who came in 30 minutes after I did) was able to leave immediately with a rental because his car was having an oil change.

This is not the first time things like this happen to me.

I explained this to my father and his response was ... "You get more bees with honey than you do with vinegar" WTF? Was there a time lapse back to 1962 that I am unaware of? My time and money is just as valuable as a man's.

Is this an American thing ... Is this a sexism thing?

It's depressing knowing that I have the rest of my life having to deal with this.